I think the answer is - because they’re lazy and want you to do their dirty work for them. I quite frankly, am not going to call the police over noise complaints because I think management should do something about that. Police should only be called when violence or tenants who get aggressive.
Not because of noise, I just think it’s management dumping responsibility onto you when they’re the ones with the power to evict people.
That’s the law in pretty much anywhere that derived their tenancy agreements from English law.
Sadly it is not common practice anywhere as your landlord violating your lease in such a way, it is difficult to get anything done about it, because ultimately you still need somewhere to live and getting out of your contract isn’t a win, in the way that your landlord getting out of his and rendering you homeless if you don’t agree to his terms is.
You can’t imagine, the guy taking 1/2 your paycheck having to actually earn that money?